diff --git a/src/character.cpp b/src/character.cpp
index 33e2b678979ae..aa476ee7d0af3 100644
--- a/src/character.cpp
+++ b/src/character.cpp
@@ -8958,7 +8958,7 @@ bool Character::consume_charges( item &used, int qty )
         return true;
     }
 
-    used.ammo_consume( qty, pos(), nullptr );
+    used.ammo_consume( qty, pos(), this );
     return false;
 }
 
diff --git a/src/item.cpp b/src/item.cpp
index 6f97572e06122..f5b2eae6a7a02 100644
--- a/src/item.cpp
+++ b/src/item.cpp
@@ -8030,7 +8030,7 @@ int item::ammo_consume( int qty, const tripoint &pos, Character *carrier )
     // Consume bio pwr directly
     if( carrier != nullptr && has_flag( flag_USES_BIONIC_POWER ) ) {
         int bio_used = std::min( units::to_kilojoule( carrier->get_power_level() ), qty );
-        carrier->mod_power_level( units::from_kilojoule( bio_used ) );
+        carrier->mod_power_level( -units::from_kilojoule( bio_used ) );
         qty -= bio_used;
     }